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Long‐term influence of manure and mineral nitrogen applications on plant and soil 15 N and 13 C values from the Broadbalk Wheat Experiment
Author(s) -
Senbayram Mehmet,
Dixon Liz,
Goulding Keith W. T.,
Bol Roland
Publication year - 2008
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3548
Subject(s) - straw , manure , soil water , delta , chemistry , nitrogen , agronomy , environmental science , soil science , inorganic chemistry , organic chemistry , biology , engineering , aerospace engineering
The Broadbalk Wheat Experiment at Rothamsted Research in the UK provides a unique opportunity to investigate the long‐term impacts of environmental change and agronomic practices on plants and soils. We examined the influence of manure and mineral fertiliser applications on temporal trends in the stable N ( 15 N) and C ( 13 C) isotopes of wheat collected during 1968–1979 and 1996–2005, and of soil collected in 1966 and 2000. The soil δ 15 N values in 1966 and 2000 were higher in manure than the mineral N supplied soil; the latter had similar or higher δ 15 N values than non‐fertilised soil. The straw δ 15 N values significantly decreased in all N treatments during 1968 to 1979, but not for 1996–2005. The straw δ 15 N values decreased under the highest mineral N supply (192 kg N ha −1 year −1 ) by 3‰ from 1968 to 1979. Mineral N supply significantly increased to straw δ 13 C values in dry years, but not in wet years. Significant correlations existed between wheat straw δ 13 C values with cumulative rainfall (March to June). The cultivar Hereward (grown 1996–2005) was less affected by changes in environmental conditions (i.e. water stress and fertiliser regime) than Cappelle Desprez (1968–1979). We conclude that, in addition to fertiliser type and application rates, water stress and, importantly, plant variety influenced plant δ 13 C and δ 15 N values. Hence, water stress and differential variety response should be considered in plant studies using plant δ 13 C and δ 15 N trends to delineate past or recent environmental or agronomic changes. Copyright © 2008 John Wiley & Sons, Ltd.